package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;



    /*
     * 新增菜品
     * @param disDTO
     * @return
     * */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        // 向菜品表插入1条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.insert(dish);

        // 获取insert后的菜品Id
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }


    }

    /*
     * 菜品分页查询
     * */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(),page.getResult());
    }

    /*
     * 批量删除菜品
     * @param ids
     * */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品??
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            Integer status = dish.getStatus();
            if (status == StatusConstant.ENABLE){
                // 菜品处于起售,不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前乘品是否能够删除---是否被套餐关联了??
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size()>0){
            // 菜品被套餐关联，不能删除
            throw  new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
//        //删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//        //删除菜品关联的口味数
//            dishFlavorMapper.deleteByDishId(id);
//        }

        // 批量删除
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /*
     * 根据id查询菜品
     * @param id
     * @return
     * */
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查菜品数据
        Dish dish = dishMapper.getById(id);
        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavorhs = dishFlavorMapper.getByDishId(id);
        // 将查询得数据封装到VO

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavorhs);

        return dishVO;
    }

    /*
     * 修改菜品的基本信息和口味信息
     * @param dishDTO
     * @return
     * */
    public void updateWithFlavor(DishDTO dishDTO) {

        // 修改基本信息
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        // 修改口味信息
        // 1.  删除所有关联的口味
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        // 2.  插入口味信息
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);

        }
    }

    /**
     * 根据分类id 查询菜品
     * @param  categoryId
     * @return
     */
    public List<Dish> getByCategoryId(Long categoryId) {
        //封装好一个Dish对象
        Dish dish=new Dish();
        dish.setCategoryId(categoryId);//根据categoryId查询菜品
        dish.setStatus(StatusConstant.ENABLE);//只查询status=1的菜品
        List<Dish> list=dishMapper.list(dish);
        return list;

    }

    /**
     * 菜品的起售和停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {

        List<Long> dishId = new ArrayList<Long>();
        dishId.add(id);

        //菜品停售，则包含菜品的套餐同时停售
        if (status == StatusConstant.DISABLE) {
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishId);
            if (setmealIds != null && setmealIds.size() > 0) {
                setmealIds.forEach(Id -> {
                    Setmeal setmeal = Setmeal.builder()
                            .id(Id)
                            .status(status)
                            .build();
                    setmealMapper.update(setmeal);
                });
            }
        }

        Dish dish=Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


}
